using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
using System.Threading;
using System.Runtime.CompilerServices;
static class Program{
	const int mod=(int)1e9+7;
	const long inf=long.MaxValue-1;
	static List<ValueTuple<int,int>>[] li;
	static bool[] b;
	static int[] ans;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		int n=s[0],m=n;
		li=new List<ValueTuple<int,int>>[n+1];
		b=new bool[n+1];
		for(int i=1;i<=n;i++){
			li[i]=new List<ValueTuple<int,int>>();
		}
		for(int i=0;i<m;i++){
			var e=sc.Ia;
			li[e[0]].Add(ValueTuple.Create(e[1],i));
			li[e[1]].Add(ValueTuple.Create(e[0],i));
		}
		ans=new int[n];
		var g=new int[n+1];
		var qu=new Queue<int>();
		for(int i = 1;i<=n;i++) {
			g[i]=li[i].Count;
			if(li[i].Count==1){qu.Enqueue(i);}
		}
		while(qu.Count>0){
			var a=qu.Dequeue();
			for(int i=0;i<li[a].Count;i++){
				if(ans[li[a][i].Item2]==0){
					b[a]=true;
					ans[li[a][i].Item2]=a;
					g[li[a][i].Item1]--;
					if(g[li[a][i].Item1]==1){qu.Enqueue(li[a][i].Item1);}
				}
			}
		}
		for(int i = 1;i<=n;i++) {
			if(!b[i]){Fu(i);}
		}
		for(int i = 1;i<=n;i++) {
			if(!b[i]){
				Console.WriteLine("No");
				return;
			}
		}
		Console.WriteLine("Yes");
		Console.WriteLine("{0}",string.Join("\n",ans));
	}
	static void Fu(int a){
		for(int i=0;i<li[a].Count;i++){
			if(ans[li[a][i].Item2]==0){
				b[a]=true;
				ans[li[a][i].Item2]=a;
				Fu(li[a][i].Item1);
			}
		}
	}
}

public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}